[jdk11u-dev] RFR: 8214761: Bug in parallel Kahan summation implementation

[Goetz Lindenmaier]

I backport this for parity with 11.0.15-oracle.

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Commit messages:
- Backport dd871819a05886ee09fc00c7c778268440ebedb7

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/707/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=707&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8214761
Stats: 235 lines in 5 files changed: 225 ins; 0 del; 10 mod
Patch: https://git.openjdk.java.net/jdk11u-dev/pull/707.diff
Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/707/head:pull/707

PR: https://git.openjdk.java.net/jdk11u-dev/pull/707